DESCRIPTION

A macro equivalent exists for each function call. Because the macro
forms are sometimes faster and have a simpler error handling interface
than the equivalent functions, they are the preferred way of calling
the Judy1 functions. See Judy1(3) for more information. The function
call definitions are included here for completeness.
One of the difficulties in using the Judy1 function calls lies in
determining whether to pass a pointer or the address of a pointer.
Since the functions that modify the Judy1 array must also modify the
pointer to the Judy1 array, you must pass the address of the pointer
rather than the pointer itself. This often leads to hard-to-debug
programmatic errors. In practice, the macros allow the compiler to
catch programming errors when pointers instead of addresses of pointers
are passed.
The Judy1 function calls have an additional parameter beyond those
specified in the macro calls. This parameter is either a pointer to an
error structure, or NULL (in which case the detailed error information
is not returned).
In the following descriptions, the functions are described in terms of
how the macros use them (only in the case of #defineJUDYERROR_NOTEST1). This is the suggested use of the macros after your program has
been fully debugged. When the JUDYERROR_NOTEST macro is not specified,
an error structure is declared to store error information returned from
the Judy1 functions when an error occurs.
Notice the placement of the & in the different functions.
Judy1Set(&PJ1Array,Index,&JError)
#define J1S(Rc_int, PJ1Array, Index) \
Rc_int = Judy1Set(&PJ1Array, Index, PJE0)
Judy1Unset(&PJ1Array,Index,&JError)
#define J1U(Rc_int, PJ1Array, Index) \
Rc_int = Judy1Unset(&PJ1Array, Index, PJE0)
Judy1Test(PJ1Array,Index,&JError)
#define J1T(Rc_int, PJ1Array, Index) \
Rc_int = Judy1Test(PJ1Array, Index, PJE0)
Judy1Count(PJ1Array,Index1,Index2,&JError)
#define J1C(Rc_word, PJ1Array, Index1, Index2) \
Rc_word = Judy1Count(PJ1Array, Index1, Index2, PJE0)
A return value of 0 can be an error, valid as a count,
or it can indicate a special case for a fully-populated
array (32-bit machines only). If necessary, the
following code can be used to disambiguate this return:
JError_t JError;
Rc_word = Judy1Count(PJ1Array, Index1, Index2, &JError);
if (Rc_word == 0)
{
if (JU_ERRNO(&JError) == JU_ERRNO_NONE)
printf("Judy1 array population == 0\n");
if (JU_ERRNO(&JError) == JU_ERRNO_FULL)
printf("Judy1 array population == 2^32\n");
if (JU_ERRNO(&JError) == JU_ERRNO_NULLPPARRAY)
goto NullArray;
if (JU_ERRNO(&JError) > JU_ERRNO_NFMAX)
goto Null_or_CorruptArray;
}
Judy1ByCount(PJ1Array,Nth,&Index,&JError)
#define J1BC(Rc_int, PJ1Array, Nth, Index) \
Rc_int = Judy1ByCount(PJ1Array, Nth, &Index, PJE0)
Judy1FreeArray(&PJ1Array,&JError)
#define J1FA(Rc_word, PJ1Array) \
Rc_word = Judy1FreeArray(&PJ1Array, PJE0)
Judy1MemUsed(PJ1Array)
#define J1MU(Rc_word, PJ1Array) \
Rc_word = Judy1MemUsed(PJ1Array)
Judy1First(PJ1Array,&Index,&JError)
#define J1F(Rc_int, PJ1Array, Index) \
Rc_int = Judy1First(PJ1Array, &Index, PJE0)
Judy1Next(PJ1Array,&Index,&JError)
#define J1N(Rc_int, PJ1Array, Index) \
Rc_int = Judy1Next(PJ1Array, &Index, PJE0)
Judy1Last(PJ1Array,&Index,&JError)
#define J1L(Rc_int, PJ1Array, Index) \
Rc_int = Judy1Last(PJ1Array, &Index, PJE0)
Judy1Prev(PJ1Array,&Index,&JError)
#define J1P(Rc_int, PJ1Array, Index) \
Rc_int = Judy1Prev(PJ1Array, &Index, PJE0)
Judy1FirstEmpty(PJ1Array,&Index,&JError)
#define J1FE(Rc_int, PJ1Array, Index) \
Rc_int = Judy1FirstEmpty(PJ1Array, &Index, PJE0)
Judy1NextEmpty(PJ1Array,&Index,&JError)
#define J1NE(Rc_int, PJ1Array, Index) \
Rc_int = Judy1NextEmpty(PJ1Array, &Index, PJE0)
Judy1LastEmpty(PJ1Array,&Index,&JError)
#define J1LE(Rc_int, PJ1Array, Index) \
Rc_int = Judy1LastEmpty(PJ1Array, &Index, PJE0)
Judy1PrevEmpty(PJ1Array,&Index,&JError)
#define J1PE(Rc_int, PJ1Array, Index) \
Rc_int = Judy1PrevEmpty(PJ1Array, &Index, PJE0)
Definitions for all of the Judy functions, the types Pvoid_t, Pcvoid_t,
PPvoid_t, Word_t, JError_t, and PJError_t, the constants NULL,
JU_ERRNO_*, JERR, and PJE0, are provided in the Judy.h header file
(/usr/include/Judy.h). Note: Callers should define Judy1 arrays as
type Pvoid_t, which can be passed by value to functions that take
Pcvoid_t (constant Pvoid_t), and also by address to functions that take
PPvoid_t.